[I] take inspiration from kids. ... They're very honest in how they act and how they are in the world.

There's an incredible comfort level that I have on film sets because it's where I've grown up.

I'm not an easy person to love. There are lots of times when I'm a very good boyfriend, but there are times when I'm useless. I mean, I'm a mess around the house. I talk nonstop. I become obsessed with things.

Richard [Griffiths] was by my side during two of the most important moments of my career. In August 2000, before official production had even begun on Potter, we filmed a shot outside the Dursleys', which was my first ever shot as Harry. I was nervous and he made me feel at ease. Seven years later, we embarked on 'Equus' together. It was my first time doing a play but, terrified as I was, his encouragement, tutelage and humor made it a joy. In fact, any room he walked into was made twice as funny and twice as clever just by his presence.

I've done seven movies in eight years, and with each movie I feel like I'm learning a lot. I'm still young-ish, so I still feel like I'm in the zone of learning and creating. Those are the perfect places to do that. And in a weird way, you have a lot of freedom.

My preparation is mainly just knowing the lines and getting in and knowing where your character is, knowing what it's about and having ideas that you can put in on the day.

To the children who loved Harry Potter, I want to say your enthusiasm was the real magic. I so enjoyed being on the journey with you. And to the adults who bought the Harry Potter books and devoured them, I just want to say, those books were for children.